• 대한기계학회논문집A
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• 제24권8호
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• pp.2131-2142
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• 2000

As recent production facilities are usually operated with unmanned material-handling system, the development of an efficient schedule with deadlock avoidance becomes a critical problem. Related researches on deadlock avoidance usually focus on real-time control of manufacturing system using deadlock avoidance policy. But little off-line optimization of deadlock-free schedule has been reported. This paper presents an optimization method for deadlock-free scheduling for Job-Shop system with no buffer. The deadlock-free schedule is acquired by the procedure that generates candidate lists of waiting operations, and applies a deadlock avoidance policy. To verify the proposed approach, simulation resultsare presented for minimizing makespan in three problem types. According to the simulation results the effect of each deadlock avoidance policy is dependent on the type of problem. When the proposed LOEM (Last Operation Exclusion Method) is employed, computing time for optimization as well as makespan is reduced.

• 한국보건간호학회지
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• 제16권2호
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• pp.412-422
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• 2002

The purpose of this study was to investigate knowledge and attitude about oral contraceptives in university students in order to provide better sex education programs and direction. The subjects of this study were 337 university students in M city, during the period from April 1 to April 20, 2001. Collected data were analyzed using descriptive statistics, t-test, Pearson correlation coefficients with SPSS package. The results from this study were summarized as follows : 1. Oral contraceptives related knowledge marked $52.6\pm7.2$ of male students and $53.9\pm5.9$ of females with a range of 14 to 70. The level of female students' knowledge was higher than that of male's but there is not statistically a significant difference(p= .080). Oral contraceptives related attitude marked $60.0\pm10.0$ of male students and $57.4\pm7.8$ of females with a range of 18 to 90. The level of male students' attitude was higher than that of female's and there is statistically a significant difference(p= .011). 2. General characteristics related to oral contraceptives review grade and religion but not related variables statistically significant. 3. Wanted age of oral contraceptives taking medicine and age was correlated positively (r=.178, p=.004). Total knowledge score of oral contraceptives and total attitude score were correlated positively(r=.467 p=.000).

• 동의생리병리학회지
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• 제25권3호
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• pp.445-450
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• 2011

In order to validate the use of Olibanum as an anti-inflammatory drug in the traditional Korean medicine, I have investigated the effect of water-soluble extract of Olibanum (EO) on the expression of pro-inflammatory vascular cell adhesion molecule-1 (VCAM-1) in human umbilical vein endothelial cells (HUVECs) stimulated with tumor necrosis factor-${\alpha}$. The extract inhibited dose-dependently VCAM-1 expression without its cytotoxic effect on HUVECs, as measured by a flow cytometer using fluorescence-enhanced anti-VCAM-1 antibody, and significantly decreased mRNA levels of VCAM-1, as determined using reverse transcription polymerase chain reaction. These results suggest that Olibanum may have therapeutic potential in the control of endothelial disorders caused by inflammation.

• 펄프종이기술
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• 제46권6호
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• pp.26-33
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• 2014

Frankincense resin was applied to Hanji to improve its physical properties. The resin-treated paper showed the increasement of physical properties such as weight, thickness, and density. The highest increasement in weight and density of resin-treated paper were found at 30% treatment concentrations and the largest values of density were $41g/m^2$ Hanji. With the increasement of concentration, the brightness was decreased and transparency was improved. Of the mechanical properties of the paper, the tensile index and burst index showed the improved values. The tear index, however, was decreased. The frankincense resin showed the highest result in the tensile index of resin-treated paper and the basis weight of $41g/m^2$ Hanji. The air resistance of the resin-treated paper got improved with the increase of the concentration and $105g/m^2$ Hanji showed the highest values. The highest improvement in air resistance may make the resin-treated Hanji possible to use for semipermeable materials.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2007년도 학술발표회 논문집
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• pp.551-555
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• 2007

하구 감조부에서의 유량측정은 수문관측매뉴얼에 의하면 일반하천의 유량측정과 같은 원칙으로 실시하며, 일반 유량측정보다 신속하게 측정하고 유속과 유량을 연속적으로 측정해야 하고 조석을 잘 고려하여 관측계획을 수립하여야 하고 측정장비는 가급적 유향, 유속계의 기록부가 내장된 장비를 이용하도록 제안하고 있으며, 현실적으로 감조하천에서 유량측정은 많은 어려움이 따른다. 최근 우리나라에서 하천유량의 효율적인 측정을 위해 초음파유속계나 지표유속법과 같은 실시간 하천유량측정 방법이 도입되고 있다. 본 연구에서는 이러한 자동유량관측이 감조하천에 가능하도록 실시간 유량관측 시스템을 개발하여 운영하였다. 조석의 영향을 받는 한강대교지점에 도플러방식 초음파유량계를 회전체에 탑재한 자동유량측정장치를 남 북단 하천에 각각 1대씩 설치하였다. 본 시스템을 운영한 결과 무인 자동 연속 정밀관측이 가능하였으며, 1회 유속측정에 소요되는 $2{\sim}3$시간을 $5{\sim}6$분으로 단축시켰다. 이를 기반으로 감조하천에서의 자동유량관측이 가능하고 지표유속법을 도입하여 정확도를 높일 수 있는 유량산정기술을 개발하였다.

• 한국미생물·생명공학회지
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• 제19권3호
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• pp.253-258
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• 1991

Aspergillus ficuum이 생산하는 exoniulinase가 CM-Sephadex, DEAE-Sepharose 6B, 및 HPLC gel filtration을 통해 단백질 mg당 약 2,800U의 specific activity로 정제되었다. 이 효소는 native 상태에서 약 83,000+1,000의 분자량을 나타냈으며 당을 함유하고 있었다. 이 효소는 최적 pH가 4.4-4.7이었고, 55'C에서 8시간 노출 후에도 그 활성을 95 유지하였다. 이 효소의 I/S ratio는 약 0.35이고 전형적인 non-speific Beta-fructofuranosidase의 특성을 나타내었으며 raffinose와 stachyose를 분해할 수 있었다.

• 한국보건간호학회지
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• 제19권1호
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• pp.64-73
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• 2005

The purpose of this study was to discuss the difference of stress by the grade, examine the relationship between characteristics and main stress, and to investigate the effect of the National Examination of Registered Nurses on stress by using the stress self-rating scale targeting university nursing students (n=314), The stress self-rating scale consists of three subscales: stress responses, stressors and coping parts, such as perceived social support and a sense of humor. The data were analyzed by descriptive statistics, t-test, Pearson's correlation coefficient and regression analysis. The results showed that passing the National Examination of Registered Nurses was the first problem among the stressors. Stressors of the living factors and nursing factors, and subjective stressors of the surveyed nursing students were the highest among the senior students, but stressors of nursing factors increased according to the grade of the nursing students. Perceived stress responses were high in psychological responses of other aspects, and perceived stress responses increased according to the grade (p<.001). Senior students had a high weight of perceived stress responses (problem-focused, emotion-focused). and active and negative coping modes. Significant factors that explained the stressors were coping mode(r=.62-82. p<.01) and cognition(r=.19. p<.01). including the social support. These findings suggest that social support was very important for seniors. and that we have to develop approaches to decrease stress according to the student grade for nursing education process.

• 보건교육건강증진학회지
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• 제26권2호
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• pp.35-47
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• 2009

Purpose: The purpose of this study was to investigate the chronic disease, health status and lifestyle, and to test the chronic disease and health status and lifestyle of rural elderly by gender. Method: The interview survey was performed in September 2004 with structured questionnaires(Scale of Long-Term Health and Welfare Need Survey) to 770 of the elderly who lived in Muan-Gun of Chunnam Province. The percentage, Chi-squire test and regression method were used for some of the cross-sectional data. Results: The 770 elderly respondents were composed of 51.3% male and 48.7% female. 59.1% of the elderly had chronic disease. About the subjective health status that 54.3% of the respondents have been answered not good health status, 87.9% of the respondents have been health examination. The related variables of chronic disease and general characteristics were education and religious level in male, age, marital status, type of social security, education and religious level in female, and health status variables were subjective health status, cognitive function, ADL, IADL, and lifestyle factors was exercise in male, examination in female. Conclusion: These results suggested that special health promotion and education programs of the health habits such as physical exercise and health examination were necessities for the elderly of rural area.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2010년도 학술발표회
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• pp.699-703
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• 2010

최근 우리나라에서도 워터프론트 개발과 주운에 많은 관심을 보이고 있는 실정이며, 현재 한강의 마곡지구에서는 워터프론트 및 주운수로 개발 사업을 수행하고 있다. 마곡 주운수로는 홍수 발생시 한강 수위 상승 전에 갑문을 폐쇄하여 한강의 홍수량이 주운수로 내부로 유입 되는 것을 방지하도록 계획되었다. 그러나 한강수위 상승 전, 마곡주운수로의 갑문 폐쇄 직전에 한강에 운항중인 선박이 주운수로 내로 긴급히 회항을 할 경우가 발생하며, 회항 선박이 안전하게 주운 수로내로의 진입하기 위해서는 갑문의 개폐 정도에 따른 갑문 내부 유속 및 유향에 대한 검토가 필요할 것으로 판단된다. 따라서 본 연구에서는 마곡 주운 수로로 유입되는 빈도별 홍수량에 따른 수로 내부 유황과 갑문 폐쇄 정도에 따른 갑문부 영향을 수리모형 실험과 수치모의를 통하여 분석하였다. 주운수로 유입 빈도별 홍수량이 증가할수록 내부의 유속은 증가 하였으며 100년빈도 홍수시 갑문부에서의 최대 유속은 2.2m/s 나타났다. 홍수시 갑문을 1/3, 1/2, 2/3 폐쇄하였을 경우에 대한 수치 모의 결과 갑문의 2/3 폐쇄시 갑문부 최대 유속은 1/3 폐쇄시에 비하여 약 53-86% 증가 하였으며, 수위는 약 0.2-0.8m 상승하였다. 갑문 폐쇄에 따른 최대 유속은 선박의 운항을 위한 허용 유속과 비교 검토하였다. 이러한 분석을 통하여 선박이 긴급히 주운수로로 회항할 경우에 대한 비상대응계획 및 운영방안 수립에 활용될 수 있을 것이다.

• 한국해양학회지
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• 제7권1호
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• pp.15-18
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• 1972

1968년 8월부터 1969년 7월까지 1년간 대한해협에서 수온 염분의 시간적 변동에 대해 조사한 결과를 요약하면 다음과 같다. 1. 수온 염분의 시간적 변동범위는 년중 8월이 가장 크고 4월이 가장 작았다. 2. 8월의 수온은 125m 층에서 5.67-15.75$^{\circ}C$로 10.08$^{\circ}C$의 최고 변동범위를 보였으며, 염분은 20m 층에서 32.09-34.32 로 2.23 의 최고 변동범위를 보였다. 3. 이렇게 수온, 염분의 시간적 변동범위가 계절에 따라 수층에 따라 큰 차이를 보이는 것은 대한해협에는 수평, 수직적으로 이질적인 다양한 수괴들이 있어 이들이 게절에 따라 분포구조가 변화할 뿐 아니라, 이곳을 통과하는 대마난류가 조석의 영향으로 시시각각 그 유향과 유속이 변동됨에 따라 이들 수괴들이 상호 수직, 수평으로 유동하기 때문인 것으로 보인다.